Propeller-wheel



(NoMndeL) W. L. STRONG.

'PROPELLER WHEEL.

No. 378,221. Patented Feb. 21, 1888.

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Warren Srnrns nrnn'r rrrcnt IVALTER L. STRONG, OF SAN FRANCISCO,CALIFORNIA.

PROPELLER-WH EEL.

SPECIFICATION forming part of Letters Patent No. 378,221, dated February21, 1888.

Application filed December 22, 1887. Serial No. 258,771. (No model.)

To JZZ whom it may concern:

Be it known that I, \VALTER L. STRONG, of the city and county of SanFrancisco, State of California, have invented an Improvement in aIropeller-IVheel; and I hereby declare the following to be a full,clear, and exact description of the same.

My invention relates to an improvement in screw-propellers.

It consists of spirall yforn1ed blades or vanes extending radiallyoutward from the hub which is to be attached to the propeller-shaft, andin combination therewith of an exterior band or ring cast with orsecured to the edges of the propeller-blades and inclosing the frontedges of the propeller-blades, while the rear ends are allowed toproject beyond and behind this ring, as will be more fully explained byreference to the accompanying drawing, in which the figure is a view ofmy propeller.

A is the hub of the propeller, which is socured to the propeller-shaftin any suitable or usual manner; and B are the blades,which may be twoor more in m1inher,and extend radially outward from the hub, having anydesired pitch as thin as is consistent with the necessary strength, soas to offer but little resistance as it passes edgcwise through thewater, and it incloses the forward part of the propellerblades. In thepresent case I have shown this hoop as covering about two-thirds of theouter edges of the blades from front toward the rear. The rear one-thirdof the blade extends behind this hoop, as shown.

The operation of this device will be as follows: The hub, forming a partof the propeller and rotating with it, holds the water and prevents itfrom being thrown outward by the rapid revolution of the propeller, andthus gives it a strong hold on the water, keeping the latter also asolid body and preventingits being churned up, and also serving to giveit impulse directly back and in the line of travel of the boat. Byleaving the rear portion of the propeller-blades uncovered it allows thewater to escape freely and discharge from the propeller without choking.

Having thus described my invention, what I claim as new, and desire toprotect by Letters Patent, is-

The propeller consisting of the hub and spi rally-disposed bladesprojecting radially therefrom, in combination with the hoop or bandsecured to and inclosing the forward portion of the blades, while therear portion of the blades are inclosed and extend rearwardly from thehoop or band, substantially as herein described.

In witness whereof I have hereunto set my hand.

XVALTEB L. STRONG. Vitnesses:

S. H. NoUnsn, H. 0. LEE.

